Hi Lars,
> If IN is not available, then OR is typically the next option to use.
Sorry, i can not resist.
It looks like SAP has not copied all the functions from other database vendors to camouflage the source 
(SAP: Ehemaliger Mitarbeiter erhebt schwere Vorwürfe gegen SAP - SPIEGEL ONLINE)
... as always - you know ... just kidding of course 
Regards from the 
from the other side
Stefan